Sign in to Google to save your progress. Tuberculosis is a highly infectious disease. Virus have the characters of both living and non-living. The infection usually stays in the lungs. Yeast helps in the production of alcohol. What precautions must be taken while taking antibiotics? Scientists who study microorganisms are called. (b) blue-green algae They are often coocus -(Spherical) or red-shaped and 0.5- 51/m in the longest dimension. [KVS 2008] Citrus canker, a bacterial disease, affects trees of citrus fruit and is spread by air. Who discovered polio vaccine? Answer: Breathing in polluted air causes respiratory diseases. (b) acetobactor Answer: (c) protozoa The low temperature in the refrigerator inhibits the growth of microbes. AIDS spreads by sharing infected injections, needles with an infected person. Question 1. Which of the following diseases is caused by a fungus? Algae tend to develop on wet surfaces. Question 38. (c) antibody The process of conversion of sugar into alcohol is known as: We should not allow water to collect in coolers, flower pots, etc. 2.3 Microorganisms and Us Microorganisms play an important role in our lives. MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Answer: Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers Pdf free download is available here. Answer: Question 12. Ivanovsky discovered viruses from tobacco plants. Medium that transmits pathogens from an infected person to a healthy one is called (b) only inside the cells of the host organisms (a) Bacillus (d) both (a) and (c), Question 4. (d) Edward Jenner, Question 25. Antibiotics must not be taken unnecessarily because it may kill beneficial bacteria also. Choose the correct option in the following questions: Question 1. The bread or dosa dough rises because of the action of: Name the bacterium found in the roots of pea plant. (b) Blue-green algae fix ______ directly from the air to enhance the fertility of soil. Question 8. 5. In which of the following human disease is or are caused by bacteria? .. is a single-celled microorganism. MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Question and Answer forum for K12 Students. You can refer to NCERT Solutions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. (iii) housefly Question 11. Viruses are the most useful microbes. (d) Edward Jenner, Question 28. Question 2. The algae commonly used as fertilisers are called: The microorganisms smaller than bacteria are If you take antibiotics when not needed, you help bacteria in your body to develop resistance to them. Question 30. Which of the following is air-borne disease: Bacteria are also involved in the making of cheese. Paheli wants to write some correct statements. Communicable diseases can spread from infected person to others when any person cough or sneeze. Spirogyra is multi-celled algae. Olympiad Test: Microorganisms Friend & Foe - Class 8 - EduRev (ii) housefly, (e) The bread or idli dough rises because of: (b) vaccine _______ are the threads of the multicellular fungi. Chapter 1 - Crop Production and Management. It is observed that the dough begins to rise up in volume. Microorganisms are useful in our lives in the following ways : Question 3. Question 6. Bacteria are ______ organisms. [CDATA[ NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (d) 110C. Nitrogen fixing bacteria increase the fertility of the soil. (a) Edward Jenner A common preservative used in jam and pickles is Question 10. Microorganisms are present all around us but they are too small to be seen with naked eye. Answer: (a) water (ii) (a) (a) fungi Microorganisms: Friend and Foe Class 8 Extra Questions and Answers What are antibodies ? The fungus that is commonly used in bakery and beverage industries is Answer: (e) > (iii) They have a simple structure, consisting of a small piece of Nucleic Acid (either DNA or RNA), surrounded by a protein coat. What do you observe after two hours? Answer: (b) female anapheles mosquito MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and In this article, we are covering Class 8 Science Chapter 2 Microorganisms - Friend and Foe. (c), Question 6. Name any two human diseases caused by viruses. Question 4. (b) A bacteria a) 2 b) 3 c) 4 d) 5 Show Answer Answer: (c) Q2. (a) tuberculosis Question 3. Activity 4 (NCERT Textbook, Page 20) You can refer to NCERT Solutions forClass 8 Science Chapter 2 Microorganisms: Friend and Foe to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. (c), Question 5. Class 8 Science Chapter 2 Extra Questions and Answers Crop Microorganisms: Friend and Foe. (c) virus Bacteria, fungi, protozoa and _______ are the major four groups in which microorganisms are classified. It is better to avoid contact with the infected person. Question 15. Question 23. (c) living as well as non-living Cholera is an infectious disease that causes severe watery diarrhea, which can lead to dehydration and even death if untreated. Answer: Question 14. 1. Question 17. Question 8. When the spores enter a deep flesh wound, they grow into bacteria that can produce a powerful toxin, tetanospasmin. Answer: Medicine that kills or stops the growth of harmful disease-causing microbes is known as (c) both (a) and (b) (a) fungi The cause of whooping cough is Question 23. (c) bacteria Virus reproduce: Answer: b) Atmospheric Oxygen fixer Answer: (b) viruses The bread or dosa dough rises because of the action of: (a) heat (b) grinding (c) growth of yeast cells (d) none of these Answer Question 3. Some microorganisms grow on other organisms while others exist freely. The virus may enter the body of a healthy person while breathing. Microorganisms that causes disease are also known as (d) contact. View solution. Cutaneous anthrax is an infection of the skin caused by direct contact with the bacterium. Question 1. Question 11. Draw a labelled diagram of virus. Microorganisms - Friend and Foe-HOTS Questions - Career Launcher They can be used to form curd, alcohol, etc. Anthrax a dangerous human and cattle diseases is also caused by bacteria. Now smell the solution. (b), Question 4. (b) carbon cycle a) Fermentation (b) decreases during day time Bacteria have an organised nucleus. Question 10. Acetobacter aceti is used for producing acetic acid from alcohol. (a) > (ii) Class 8 Science Chapter 2 MCQ Class 8 Science Chapter 2 MCQ Tests for Exams Class 8 Science Chapter 2 MCQ Tests of Microorganism: Friend and Foe with complete explanation and answers. They are on the boundary between living and non-living. Microorganisms that grow on our food sometimes produce toxic substances. (a) Bacteria Tick the correct answer. Read More: Write a short paragraph on the harmful effects of microorganisms, Science MCQs for Class 8 Chapter Wise with Answers, Write a short paragraph on the harmful effects of microorganisms, NCERT Books For Class 8 PDF| Download NCERT Textbook Maths, Science, Hindi, English, SST Free PDF, NCERT Books for Class 9 PDF Download (2022-23 Edition), SCERT Kerala Books for Class 11 Gandhian Studies | Kerala State Syllabus 11th Standard Textbooks English Malayalam Medium, SCERT Kerala Books for Class 11 Music | Kerala State Syllabus 11th Standard Textbooks English Malayalam Medium, Rajasthan Board Class 1 Books | RBSE Class 1st State Syllabus Textbooks PDF Download, Rajasthan Board Class 2 Books | RBSE Class 2nd State Syllabus Textbooks PDF Download, Rajasthan Board Class 3 Books | RBSE Class 3rd State Syllabus Textbooks PDF Download, Rajasthan Board Class 4 Books | RBSE Class 4th State Syllabus Textbooks PDF Download, Rajasthan Board Class 5 Books | RBSE Class 5th State Syllabus Textbooks PDF Download, https://www.youtube.com/watch?v=nd-0HFd58P8. (b) tuberculosis Question 4. (d) wound (d) Rhizopus, Question 14. Anabaena is listed in the category of algae. (a) microscope Choose the correct statements: What do you mean by communicable diseases? Add half a spoon of yeast powder to the sugar solution. Fill in the spaces with these questions and answers to assess your level of readiness. Paheli is writing some sentences about algae. (d) algae, Question 15. [MSE (Chandigarh) 2008, 2006] (b) Plasmodium (c) fungi Algae, yeast, fungi or bacteria may be used as an ingredient or a substitute for protein-rich foods that are suitable for human or animal consumption. Pasteurisation prevents the growth of in milk. Bacteria is cause of whooping cough. (a) yeast Question 9. Which microorganism causes AIDS? Influenza and cough. Question 9. Female Aedes mosquito acts as carrier of dengue virus. (c) the earthworm (d) fungi, Question 24. Draw a neat and well-labelled diagram of Spirogyra. (c) typhoid The rod shaped bacteria are called (a) Bacillus (b) Coccus (a) bacteria (d) none of these. Assertion Reason Questions for Class 8 Science Chapter 2 Microorganisms The disease caused by a protozoan and spread by an insect is _______. All microbes are disease-causing. (d) none of these. (a) Heat (b) Grinding (c) Growth of yeast cells (d) Low pressure Answer Question 4. Answer: Take two pots and fill each pot half with soil. (a) germs Malaria is the disease which is caused by the spread of a Protozoan i.e. Microorganisms :Friend and Foe (part-1) | Class 8 - YouTube Lakhmir Singh Science Class 8 Solutions Chapter 2 Micro-Organisms Hence, your answer will be option [D]. (a) staphylococcus (a) kidney trouble Question 5. (d) bacterium, Question 29. Answer: Answer: What is a vaccine ? Disease-causing microorganisms are called .. (c) both (a) and (b) Microorganisms Friend And Foe Biology . (i) heat (iv) oxygen Viruses are the most useful microbes. (f) > (iii), Question 10. (a) algae Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Microorganisms - Friend and Foe. Answer: NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe in English and Hindi Medium to Study Online or Download in PDF file format updated for new academic session 2023-24 following the latest CBSE Syllabus. What precautions must be taken while taking antibiotics ? Nitrogen fixing bacteria convert the atmospheric nitrogen into nitrates. Microorganisms are harmful to us in many ways. Rhizobium is the bacterium found in the roots of pea plant. Simple, plant-like microorganisms are called Hence, by keeping the surroundings clean and dry, we can prevent mosquitoes from breeding. 6. (d) algae Tetanus is caused by a toxin made by spores of bacteria, Clostridium tetani, found in soil, dust and animal feces. Describe the nitrogen cycle with the help of a neat and labelled diagram. .. are the smallest of all microorganisms. Answer: Bacteria are ______ organisms. MCQ Questions for Class 8 Science: Ch 2 Microorganisms: Friend and Foe A plant disease called citrus canker is caused by a _________ . Edward Jenner discovered the process of fermentation. Tiny organisms which cannot be seen with the naked eyes are called (a) microorganisms (b) animals (c) fungi (d) bacteria Answer Question 2. Answer: Question 17. (b) animals Flu, cough and cold are caused by _______, Question 13. (a) respiration MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Coccus or spherical, e.g., Streptococcus. Question 7. (a) lactobacillus Agar is made from a type of red .. 7. Answer: Some of them are beneficial in many ways whereas some others are Microorganisms have been used for (d) spiral, Question 8. Question 17. (a) only outside the cells of the host organisms (c) growth of yeast cells Can microorganisms be seen with the naked eye? Answer: (b) antigen Meat and fish are preserved by covering them with dry salt to check the growth of bacteria. 4. Answer: Choose which of the following statements is or are incorrect? The percentage of nitrogen in the atmosphere remains more or less constant. (b) Antony Von Leuwen Hook b) Pasteurisation b) Antibiotics (b), Question 8. 11. Question 4. Can microorganisms be seen with the naked eye ? (b) tuberculosis Join / Login >> Class 8 >> Biology >> Microorganisms: Friend and Foe >> Hard Questions. Answer: Question 14. Which of the following disease causing pathogens is / are carried by mosquitoes? Question 37. Some bacteria fix atmospheric nitrogen and increase soil fertility. [MSE (Chandigarh) 2005, 2007] Question 1. (b) fungus (b) germs Class 8 Science Chapter 2 Extra Questions, NCERT Solutions for Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Physical Education, NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Physical Education, NCERT Solutions for Class 12 Political Science, MCQ Tests of Microorganism: Friend and Foe. Draw a well-labelled diagram of Paramecium. (b) Grinding (c) rhizobium When yeast powder is put in sugar solution and kept for few hours, fermentation takes place. Some micro-organisms are useful to us in many ways, while some are definitely harmful since they cause diseases. Question 4. Answer: (b) nitrogen Microorganisms can be seen with the help of a .. Blue-green algae fix directly from air to enhance fertility of soil. [MSE (iChandigarh) 2007]. (b) Coccus NCERT Solutions for Class 8 Science Chapter 2 Microorganisms: Friend _______ are the agents that act as carriers of a pathogen and spread diseases. The Short & Long Questions: Microorganisms : Friend or Foe is an invaluable resource that delves deep into the core of the Class 8 exam. Give the methods of prevention of cholera. (c) Fungi (d) Cholera is caused by ______ Two important antibiotics are Tetracycline and Bacitracin. .. are the threads of the multicellular fungi. All mosquitoes breed in water. NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe .. (disease) is caused by mycoplasma. It is caused by eating food or drinking water contaminated with a bacterium called Vibrio cholerae. Virus can only multiply in living cells. (b) 50C (a) Heat Tuberculosis is a disease caused by: (d) Amoeba, Question 3. Question 11. Question 8. is used to preserve meat and fish. Algae and fungi are multicellular. Question 21. (b) water CBSE Class 8 Science Chapter 2 Microorganisms: Friend and Foe Objective student today we are going to discuss about the Second chapter of Ncert science class 8 chapter 'Microorganisms:Friend and foe. Viruses are the smallest living organisms, ranging in size from about 20-300 mm on average. Answer Question 3. Streptomycin is the antibiotics but hemocyanin is a protein found in mollusks that carries oxygen in much the same way as hemoglobin carries oxygen in human blood. Question 2. (d) Bacillus, Question 12. Lactobacillus is commonly found in Tamilnadu Board Class 10 English Solutions, Tamilnadu Board Class 9 Science Solutions, Tamilnadu Board Class 9 Social Science Solutions, Tamilnadu Board Class 9 English Solutions, MCQ Questions for Class 8 Science with Answers, List of 20 Different Toughest Courses in the World | Top Most Difficult Courses in the World 2021, Weathering the Storm in Ersama Extra Questions and Answers Class 9 English Moments, DAV Class 5 Maths Chapter 8 Worksheet 2 Solutions, DAV Class 7 Sanskrit Book Solutions Chapter 8 , DAV Class 5 Maths Chapter 8 Worksheet 1 Solutions, DAV Class 6 Maths Chapter 13 Brain Teasers Solutions, DAV Class 6 Maths Chapter 13 Worksheet 2 Solutions, DAV Class 5 Maths Chapter 7 Brain Teasers Solutions, DAV Class 6 Maths Chapter 13 Worksheet 1 Solutions, DAV Class 6 Maths Chapter 14 Brain Teasers Solutions, DAV Class 5 Maths Chapter 7 Worksheet 13 Solutions, DAV Class 7 Sanskrit Book Solutions Chapter 7 , DAV Class 5 Maths Chapter 7 Worksheet 12 Solutions. Potozoan shaped like a slipper is paramecium. In this article, we are covering Class 8 Science Chapter 2 Microorganisms - Friend and Foe. Hope the information shared regarding the NCERT MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers Pdf free download is true and genuine as far as our knowledge is concerned. Chemicals (salts, etc.) This food-borne illness is called food poisoning. (iii) dragonfly Question 22. Answer: (c) pickles Answer: Antibiotics are effective against Microorganisms are present in soil, water, outer space and inside the body of animals. BCG vaccine is used to curb tuberculosis. Question 1. Paheli wants to know the incorrect statements, given by her teacher as home-work? All these statements are correct. What are communicable diseases ? (a) bacilli 19. Match the organisms in column A with their action in column B. Jams, jellies and squashes are preserved by sugar. Protozoa called plasmodium is the cause of malaria. Cholera, chicken pox are some well-known examples of .. diseases. (c) Vibriocholarae (d) viruses, Question 24. (b) > (ii) How does a vaccine act ? Question 1. (a) A protozoa There are no secrets to success. Choose the incorrect sentence(s): Paheli and boojho discussed a topic of microorganisms. C8 Science Ch2 Microorganisms : Friend and Foe NEW. (c) polio Bacillus anthracis is an aerobic spore-forming bacterium that causes disease in humans and animals.

Daisy Elementary School Staff, How To Remove A Business From My Address, How To Stop Obsessing Over A Coworker, Tennessee Baseball Capacity, Montgomery County, Maryland Demographics, Articles M